How do I convert a decimal number of months to a datetime format?

31 次查看（过去 30 天）
Jake
Jake 2024-10-5
评论： Christien 2024-10-20
I have a vector of several decimal values that represent a number of months after Jan 01, 2020.
(e.g. [9.545563 22.212227])
I need to convert these to dates. I'm unsure of how to do this. The ultimate goal of this is to output the dates within an fprintf statement.
(e.g. "Summer 2021/2022 begins on the 3rd of Dec at 3:51:14 and concludes on the 24th of Feb at 22:03:52")

请先登录，再回答此问题。

回答（2 个）

Stephen23
Stephen23 2024-10-6
编辑：Stephen23 2024-10-6
Ran in:
"The only way I can think of is manually converting by identifying the length of the month the offset represents."
Let MATLAB do that for you:
V = [9.545563,22.212227];
W = fix(V);
X = mod(V,1);
A = datetime(2020,W+1,1);
D = A + X.*(datetime(2020,W+2,1)-A)
D = 1x2 datetime array
17-Oct-2020 21:53:55 07-Nov-2021 08:48:12
For most of those date formats you could download my function DATESTR8601:
https://www.mathworks.com/matlabcentral/fileexchange/34095-date-vector-number-to-iso-8601-date-string
[y,d,m,t] = datestr8601(D(1),'y','d*','mmm','*HMS')
y = '2020'
d = '17th'
m = 'Oct'
t = '21:53:55'
[y,d,m,t] = datestr8601(D(2),'y','d*','mmm','*HMS')
y = '2021'
d = '7th'
m = 'Nov'
t = '08:48:12'
Walter Roberson
Walter Roberson 2024-10-5
Ran in:
decmonths = [9.545563 22.212227];
offsets = calmonths(floor(decmonths)) + days(decmonths - floor(decmonths))
offsets = 1x2 calendarDuration array
9mo 13h 5m 36.643s 1y 10mo 5h 5m 36.413s
base = datetime('Jan-01, 2020', 'InputFormat', 'MMM-dd, yyyy')
base = datetime
01-Jan-2020
base + offsets
ans = 1x2 datetime array
01-Oct-2020 13:05:36 01-Nov-2021 05:05:36
Getting the correct output format of "3rd" and "24th" is more difficult. There are no standard routines that will correctly produce that format. (Perhaps there are Java routines for it; I do not know.)
  4 个评论
显示 2更早的评论
Walter Roberson
Walter Roberson 2024-10-5
@Voss is right, I messed up the fractions of a month. Unfortunately, I am having trouble coming up with the correct formula .
Jake
Jake 2024-10-6
The only way I can think of is manually converting by identifying the length of the month the offset represents.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Dates and Time 的更多信息

标签

产品


版本

R2024a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by